The two-time world champion is out of contract with Aston Martin at the end of the season and has not yet decided whether he will continue in F1 next year.
But with Barcelona absent from the 2027 calendar before returning in 2028, Alonso conceded there is a realistic chance this weekend will be his last home appearance at the venue in a Formula 1 car.
“It’s going to be a special weekend. This is probably my last Barcelona race in Formula 1, so I want to say thanks to everyone,” Alonso said.
“I will try to enjoy the weekend. I will not be competitive and I will not be too long in the car in qualifying – in the race, hopefully yes, but not at the pace that we all want.
“I want everyone to still enjoy the weekend.
“It has always been a celebration when we come to Barcelona. I think this is my 23rd Grand Prix [here] and all of them have been magical.
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“This last has to be magical as well.”
Alonso’s comments do not amount to a retirement announcement, with the Spaniard making clear he has yet to settle on his plans for 2027.
However, the timing of Barcelona’s rotation on the F1 calendar means the next race at the circuit is not scheduled until 2028, making his presence far from certain by the time the event returns.
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Asked whether he expected to still be racing when Barcelona next hosts a grand prix, Alonso said the uncertainty around next season made it impossible to look that far ahead.
“I don’t have anything in mind. After summer I will take the decision to continue or not,” he said.
“Barcelona obviously is not happening next year, so if I don’t know what I will do next year, it’s nearly impossible to be sure what I will do in two years’ time.
“I consider every race I go to this year potentially could be my last time – in Australia, my last time in China, my last time in Monaco.
“Here in Barcelona there is a little bit more of that chance as it’s not happening next year.”
The 44-year-old has continued to attract major support in Spain despite Aston Martin’s difficult start to the season, with the team struggling near the back of the field for much of the opening phase of 2026.
Alonso scored Aston Martin’s first point of the season last time out in Monaco, but admitted he does not expect to fight near the front this weekend at the circuit where he claimed his most recent F1 victory in 2013.
His future has become a growing talking point as the season has developed, with Alonso previously indicating that becoming a father has changed his outlook, even if he still wants to remain involved in racing in some form.
Despite that uncertainty, Alonso said he was not unsettled by the possibility that his F1 career could be approaching its final races.
“For me, the hardest thing is not to win races and not to be competitive,” he said.
“If it’s the last, or not the last, is not affecting me too much.
“I’m at peace with my career and with my life, and you know, if anything comes now, you know, [it’s] welcome.
“If it doesn’t come, it will not change my feeling.
“I’ve achieved a lot more than I ever dreamt when I was a kid, or when I was here.
“My first test here, or my go-kart experience, when I was racing in Spain, I never dreamed to be Formula 1 driver, race the best teams in the paddock and stay for a very long time.
“So everything is a plus, and it is a plus now.
“I’m not as competitive as we all want to be in the team now, and that’s probably the biggest pain that we go through every weekend, but in terms of personal feeling, it’s not too hard.”
Alonso remains the only Spanish driver to have won the F1 world championship, claiming back-to-back titles in 2005 and 2006, while he has also won three races on Spanish soil, with victories at Barcelona in 2006 and 2013 and Valencia in 2012.
2026 F1 Barcelona Grand Prix – Schedule, how to watch, TV times & more
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